US organizations/sites
All-domain Anomaly Resolution Office (AARO) — The US government official UFO project
The Black Vault — A repository of official documents on UFOs and other topics obtained through FOIA requests by John Greenewald
David Marler, UFO Researcher and CUFOS board member — Document, video and audio archives
Limina: The Journal of UAP Studies
Mutual UFO Network — An international membership organization
National Aviation Reporting Center on Anomalous Phenomena — Dedicated to the documentation and analysis of aviation safety-related encounters with UAP
National UFO Historical Records Center — A facility that preserves and digitizes historical UFO documents and media
National UFO Reporting Center — Run by Peter Davenport, this organization accepts reports of UFO sightings
Nicap.org — A successor to the National Investigations Committee on Aerial Phenomena (1956–1980), this site, run by Fran Ridge, maintains a chronology of UFO sightings and other resources
Project 1947 — Documents on the 1947 UFO wave and the beginning of the modern UFO era, maintained by Jan Aldrich
Project Blue Book — Original documents from the US Air Force’s Project Blue Book
Scientific Coalition for UAP Studies — A think tank of scientists, researchers, and other professionals exploring the UFO phenomenon
Society for UAP Studies — An academic-focused organization with the goal to redefine and redirect the study of UAP, transforming it into a recognized academic field rather than merely a frontier science.
UAPx — A scientific group focused on gathering instrumented data on UAP sightings
UFO Archive — Collection of documents, catalogs, and newsletters aintained by Barry Greenwood
Non-US organizations/sites
Archives for the Unexplained (AFU) — A group in Sweden dedicated to the collection of books, periodicals, personal archives, electronic files, and other information on UFOs and anomalous phenomena worldwide
British UFO Research Association (BUFORA) — A major UFO investigation group in the UK
Centro Italiano Studi Ufologici (CISU) — The leading UFO organization in Italy
Comité Belge d’Étude des Phénomènes Spatiaux (COBEPS) — A UFO investigation group in Belgium
Gesellschaft zur Erforschung des UFO-Phänomens (GEP) — A UFO research group in Germany
Groupe d’Études et d’Informations sur les Phénomènes Aérospatiaux Non-identifiés (GEIPAN) — A unit of the French space agency charged with investigating UFO reports
Isaac Koi’s UFO Resources — UFO cases, UFO periodicals, UFO videos
Norsk UFOsenter — A UFO investigation group in Norway
Project Hessdalen — Dedicated to the study of earthlights seen in the Hessdalen valley in Norway
Riksorganisationen UFO-Sverige — A UFO investigation group in Sweden
Skandinavisk UFO Information (SUFOI) — A UFO investigation group in Denmark
UFO Blogs
The Anomalist — Anomalist Books
The Big Study – Michael D. Swords (not updated but excellent content)
Blue Blurry Lines — Curt Collins
A Different Perspective — Kevin D. Randle
ENTAUS — Mike Cifone
GrenzWissenschaft-aktuell — Andreas Müller (in German)
Inexplicata: The Journal of Hispanic Ufology — Scott Corrales
Life in Jonestown — Billy Cox
New material added to archives — Isaac Koi
The Oz Files — Bill Chalker
Revista UFO — (in Portuguese)
The Saucers That Time Forgot — Curt Collins
Ufology Research — Chris Rutkowski
Unidentified Aerial Phenomena: Scientific Research — Keith Basterfield
UFO Detection and Observation Projects
The Galileo Project — Harvard University, the search for extraterrestrial technological signatures
Multiple Anomaly Detection and Automated Recording (MADAR) — Fran Ridge
Sky360 — Citizen science project
UAP Tracker — A daily live stream on YouTube watching the skies for anomalous events
UAPx — A UFO data collection effort
UFO Data Acquisition Project — Optical tracking system and data collection from multiple sensors
UFODATA — A crowd-funded automated UFO surveillance network